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NGC 2440 is a planetary nebula, one of many in our galaxy. Its central star, HD 62166,[1] is possibly the hottest known white dwarf. The nebula is situated in the constellation Puppis.
| Emission nebula | |
|---|---|
| Planetary nebula | |
 NGC 2440, as taken by the Hubble Space Telescope | |
| Observation data: J2000 epoch | |
| Right ascension | 07h 41m 54.91s[1] |
| Declination | −18° 12′ 29.7″[1] |
| Distance | 4.00 kly (1.23 kpc)[2] ly |
| Apparent magnitude (V) | 9.4[3] |
| Apparent dimensions (V) | 74" × 42"[3] |
| Constellation | Puppis |
| Designations | ESO 560-PN9, Bow Nebula |
It was discovered by William Herschel on March 4, 1790. He described it as "a beautiful planetary nebula of a considerable degree of brightness, not very well defined."[3] The nebula is located about 1.23 kiloparsecs (3.79×1019 m) or about 4,000 light years from the Sun.[2]
HD 62166
HD 62166 has an exceptionally high surface temperature of about 200,000 kelvins[2] and a luminosity 1,100 times that of the Sun.[4] This dense star, with an estimated 0.6 solar mass and 0.028 solar radius,[4] has an apparent magnitude of 17.5.[5]
Notes
References
- SIMBAD (January 9, 2007), Results for NGC 2440, SIMBAD, Centre de Données Astronomiques de Strasbourg
- Nemiroff, R.; Bonnell, J., eds. (February 15, 2007). "Planetary Nebula NGC 2440". Astronomy Picture of the Day. NASA.
- James, Renée; Marion, Howie (April 2006), "X-treme Stars of the cosmos", Astronomy, 34 (4): 34–39, Bibcode:2006Ast....34d..34J
{{citation}}: External link in|journal= - O'Meara, Stephen James (2007), "Albino Butterfly, Kiss Nebula, Little Lips Nebula: NGC 2440", Hidden Treasures: 204–208
External links
- Hubble Space Telescope reveals NGC 2440 on YouTube
- NASA Astronomy Picture of the Day: Planetary Nebula NGC 2440 (15 February 2007)
- NASA Astronomy Picture of the Day: NGC 2440: Cocoon of a New White Dwarf (7 May 2006)
- NASA Astronomy Picture of the Day: NGC 2440 Nucleus: The Hottest Star? (30 November 1995)
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На других языках
[de] NGC 2440
NGC 2440 ist die Bezeichnung eines planetarischen Nebels im Sternbild Puppis. NGC 2440 hat eine Winkelausdehnung von rund 1,32 Bogenminuten und eine Helligkeit von 9,4 mag. Sein Zentralstern, ein Weißer Zwerg, ist mit knapp 200.000 K Oberflächentemperatur der heißeste bekannte Stern und leuchtet im sichtbaren Licht mit einer scheinbaren Helligkeit von 17,7 mag. Seine absolute Leuchtkraft übertrifft die unserer Sonne um das 250-fache.- [en] NGC 2440
[es] NGC 2440
NGC 2440 es una nebulosa planetaria en la constelación de Puppis, la popa del Argo Navis. Se encuentra a unos 4000 años luz de distancia de la Tierra.[1] Fue descubierta el 4 de marzo de 1790 por William Herschel.[ru] NGC 2440
NGC 2440 (другие обозначения — PK 234+2.1, ESO 560-PN9) — планетарная туманность в созвездии Корма. Остаток звезды подобной Солнцу.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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